Frame stippling is a DIY thing. Go here:
https://store.otdefense.com/collections/stippling-products and buy some tips and some practice strips of kydex. I recommend the Thorns tip. Very easy and fast to use and provides a very aggressive grip that is still easy on the hands.
Getting a slide milled for an optic and front serrations is less than $200 including re-heat treating with salt bath nitriding. Depending on who you go to it may be as quick as 4 weeks or as long as 10. DP Customs is doing my G17 slide (optic cut, front serrations, nitride) for $180 and 7 weeks.
ETA if you're starting with a gen 5, you don't need to pay for front serrations so your cost and lead time will be less.